128247812731 has 2 divisors, whose sum is σ = 128247812732. Its totient is φ = 128247812730.

The previous prime is 128247812687. The next prime is 128247812741. The reversal of 128247812731 is 137218742821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128247812731 - 2³³ = 119657878139 is a prime.

It is a super-2 number, since 2×128247812731² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (128247812741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64123906365 + 64123906366.

It is an arithmetic number, because the mean of its divisors is an integer number (64123906366).

Almost surely, 2^128247812731 is an apocalyptic number.

128247812731 is a deficient number, since it is larger than the sum of its proper divisors (1).

128247812731 is an equidigital number, since it uses as much as digits as its factorization.

128247812731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 301056, while the sum is 46.

The spelling of 128247812731 in words is "one hundred twenty-eight billion, two hundred forty-seven million, eight hundred twelve thousand, seven hundred thirty-one".